The client diagnosed with multiple sclerosis is scheduled for a magnetic resonance imaging (MRI) scan of the head. Which information should the nurse teach the client about the test?

D The test will be repeated at intervals during a five (5)- to six (6)-hour period. C The client will drink a contrast medium 30 minutes to one (1) hour before the test. B The machine will be loud and the client must not move the head during the test. A The client will have wires attached to the scalp and lights will flash off and on.